*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --font-display: 'Outfit', 'Noto Sans SC', sans-serif;
  --font-heading: 'Chakra Petch', 'Noto Sans SC', sans-serif;
  --font-body: 'Noto Sans SC', sans-serif;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --radius-md: 12px;
}

[data-theme="light"] {
  --bg-primary: #f4f2ee;
  --bg-secondary: #eae7e0;
  --bg-card: #ffffff;
  --bg-nav: rgba(244, 242, 238, 0.88);
  --text-primary: #1a1a2e;
  --text-secondary: #6b6b80;
  --text-muted: #9e9eb0;
  --accent: #e0153d;
  --accent-soft: rgba(224, 21, 61, 0.08);
  --border: rgba(0, 0, 0, 0.07);
}

[data-theme="dark"] {
  --bg-primary: #08080f;
  --bg-secondary: #0e0e1a;
  --bg-card: #141425;
  --bg-nav: rgba(8, 8, 15, 0.82);
  --text-primary: #ededf4;
  --text-secondary: #7a7a9a;
  --text-muted: #4a4a65;
  --accent: #ff2d55;
  --accent-soft: rgba(255, 45, 85, 0.12);
  --border: rgba(255, 255, 255, 0.06);
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background 0.4s ease, color 0.3s ease;
}
a { text-decoration: none; color: inherit; }
button { border: none; background: none; cursor: pointer; font-family: inherit; color: inherit; }

.container { max-width: 1320px; margin: 0 auto; padding: 0 24px; }

/* Navbar */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid var(--border);
}
.navbar-inner { display: flex; align-items: center; height: 64px; gap: 32px; }
.logo {
  font-family: var(--font-heading); font-size: 22px; font-weight: 700;
  letter-spacing: 2px; text-transform: uppercase; color: var(--text-primary);
  flex-shrink: 0; display: flex; align-items: center; gap: 8px;
}
.logo-accent { color: var(--accent); }
.logo-dot { width: 8px; height: 8px; background: var(--accent); border-radius: 50%; }
.nav-links { display: flex; gap: 20px; list-style: none; flex-wrap: wrap; }
.nav-links a {
  font-family: var(--font-heading); font-size: 12px; font-weight: 600;
  letter-spacing: 1px; text-transform: uppercase; color: var(--text-secondary);
  transition: color 0.3s ease; padding: 4px 0;
}
.nav-links a:hover { color: var(--accent); }
.nav-spacer { flex: 1; }
.theme-toggle {
  width: 38px; height: 38px; display: flex; align-items: center; justify-content: center;
  border-radius: 50%; background: var(--bg-card); border: 1px solid var(--border);
  flex-shrink: 0;
}
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

.nav-auth { display: flex; gap: 8px; flex-shrink: 0; }
.nav-btn { font-family: var(--font-heading); font-size: 12px; font-weight: 600; letter-spacing: 0.5px; padding: 7px 16px; border-radius: 100px; transition: all 0.3s ease; white-space: nowrap; }
.nav-btn-ghost { border: 1px solid var(--border); color: var(--text-secondary); }
.nav-btn-ghost:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.nav-btn-primary { background: var(--accent); color: #fff; }
.nav-btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }
.nav-btn-accent { background: var(--accent2); color: #fff; }
.nav-btn-accent:hover { opacity: 0.9; transform: translateY(-1px); }

/* Breadcrumb */
.breadcrumb {
  margin-top: 64px; padding: 16px 0;
  border-bottom: 1px solid var(--border);
  font-size: 13px; color: var(--text-muted);
}
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb-sep { margin: 0 8px; }

/* Doc Content */
.doc-page { padding: 48px 0 80px; }
.doc-content {
  max-width: 820px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 48px;
}
.doc-title {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 900;
  margin-bottom: 8px;
  line-height: 1.3;
}
.doc-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}
.doc-body h2 {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  margin: 32px 0 16px;
  padding-left: 12px;
  border-left: 3px solid var(--accent);
  letter-spacing: 0.5px;
}
.doc-body h3 {
  font-size: 16px;
  font-weight: 700;
  margin: 24px 0 12px;
}
.doc-body p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--text-secondary);
  margin-bottom: 12px;
  text-align: justify;
}
.doc-body .info-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px 24px;
  margin: 16px 0;
}
.doc-body .info-label {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 14px;
}
.doc-body .info-value {
  color: var(--text-secondary);
  font-size: 14px;
}

/* Footer */
.footer { border-top: 1px solid var(--border); padding: 32px 0; text-align: center; }
.footer-text { font-size: 12px; color: var(--text-muted); }

@media (max-width: 768px) {
  .nav-links { display: none; }
  .doc-content { padding: 24px; }
  .doc-title { font-size: 24px; }
}